package com.cz.nongyetongv5.custom;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.cz.nongyetongv5.R;
import com.cz.nongyetongv5.adapter.NewsListAdapter;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * ListView下拉刷新
 *
 */
public class CustomListView extends ListView implements OnScrollListener {


	private final static int RELEASE_To_REFRESH = 0;
	public final static int PULL_To_REFRESH = 1;
	private final static int REFRESHING = 2;
	private final static int DONE = 3;
	private final static int LOADING = 4;

	// 实际的padding的距离与界面上偏移距离的比例
	private final static int RATIO = 3;

	private LayoutInflater inflater;

	private LinearLayout headView;

	private TextView tipsTextview;
	private TextView lastUpdatedTextView;
	private ImageView arrowImageView;
	private ProgressBar progressBar;


	private RotateAnimation animation;
	private RotateAnimation reverseAnimation;

	// 用于保证startY的在一个完整的touch事件中只被记录一?
	private boolean isRecored;

	private int headContentWidth;
	private int headContentHeight;

	private int startY;
	private int firstItemIndex;

	private int state;

	private boolean isBack;

	private OnRefreshListener refreshListener;
	private OnLoadListener loadListener;

	private boolean isRefreshable;

	private ProgressBar moreProgressBar;
	private TextView loadMoreView;
	private View moreView;

	public CustomListView(Context context) {
		super(context);
		init(context);
	}

	public CustomListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init(context);
	}


	private void init(Context context) {
		setCacheColorHint(context.getResources().getColor(R.color.transparent));
		inflater = LayoutInflater.from(context);

		headView = (LinearLayout) inflater.inflate(R.layout.head, null);

		arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);
		arrowImageView.setMinimumWidth(70);
		arrowImageView.setMinimumHeight(50);
		progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);
		tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);
		lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);

		measureView(headView);
		headContentHeight = headView.getMeasuredHeight();
		headContentWidth = headView.getMeasuredWidth();

		headView.setPadding(0, -1 * headContentHeight, 0, 0);
		headView.invalidate();

		Log.v("size", "width:" + headContentWidth + " height:" + headContentHeight);

		addHeaderView(headView, null, false);
		setOnScrollListener(this);

		animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
		animation.setInterpolator(new LinearInterpolator());
		animation.setDuration(250);
		animation.setFillAfter(true);

		reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
		reverseAnimation.setInterpolator(new LinearInterpolator());
		reverseAnimation.setDuration(200);
		reverseAnimation.setFillAfter(true);

		state = DONE;
		isRefreshable = false;

		moreView = LayoutInflater.from(context).inflate(R.layout.listfooter_more, null);
		moreView.setVisibility(View.VISIBLE);
		moreProgressBar = (ProgressBar) moreView.findViewById(R.id.pull_to_refresh_progress);
		loadMoreView = (TextView) moreView.findViewById(R.id.load_more);
		moreView.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				onLoad();
			}
		});
		addFooterView(moreView);

	}
	public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2, int arg3) {
		firstItemIndex = firstVisiableItem;

	}

	public void onScrollStateChanged(AbsListView arg0, int scrollState) {

		if (this.getAdapter() instanceof NewsListAdapter){

			NewsListAdapter adapter =  (NewsListAdapter) this.getAdapter() ;
			switch (scrollState) {
				case OnScrollListener.SCROLL_STATE_FLING:

					adapter.setFlagBusy(true) ;
					break;
				case OnScrollListener.SCROLL_STATE_IDLE:
					adapter.setFlagBusy(false);
					break;
				case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
					adapter.setFlagBusy(false);
					break;
				default:
					break;
			}

			adapter.notifyDataSetChanged();
		}


	}


	@Override
	public boolean onTouchEvent(MotionEvent event) {

		if (isRefreshable) {
			switch (event.getAction()) {
				case MotionEvent.ACTION_DOWN:



					if (firstItemIndex == 0 && !isRecored) {
						isRecored = true;
						startY = (int) event.getY();
					}
					break;

				case MotionEvent.ACTION_UP:

					if (state != REFRESHING && state != LOADING) {
						if (state == DONE) {

						}
						if (state == PULL_To_REFRESH) {
							state = DONE;
							changeHeaderViewByState();
						}
						if (state == RELEASE_To_REFRESH) {
							state = REFRESHING;
							changeHeaderViewByState();
							onRefresh();
						}
					}

					isRecored = false;
					isBack = false;

					break;

				case MotionEvent.ACTION_MOVE:


					int tempY = (int) event.getY();

					if (!isRecored && firstItemIndex == 0) {
						isRecored = true;
						startY = tempY;
					}

					if (state != REFRESHING && isRecored && state != LOADING) {

						// 保证在设置padding的过程中，当前的位置?是在head，否则如果当列表超出屏幕的话，当在上推的时?，列表会同时进行滚动
						// 可以松手去刷新了
						if (state == RELEASE_To_REFRESH) {

							setSelection(0);

							// ?推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步
							if (((tempY - startY) / RATIO < headContentHeight) && (tempY - startY) > 0) {
								state = PULL_To_REFRESH;
								changeHeaderViewByState();
							}
							// ?子推到顶?
							else if (tempY - startY <= 0) {
								state = DONE;
								changeHeaderViewByState();
							}
							// ?拉了，或者还没有上推到屏幕顶部掩盖head的地?
						}
						// 还没有到达显示松?新的时?,DONE或?是PULL_To_REFRESH状?
						if (state == PULL_To_REFRESH) {

							setSelection(0);

							// 下拉到可以进入RELEASE_TO_REFRESH的状?
							if ((tempY - startY) / RATIO >= headContentHeight) {
								state = RELEASE_To_REFRESH;
								isBack = true;
								changeHeaderViewByState();
							}
							else if (tempY - startY <= 0) {
								state = DONE;
								changeHeaderViewByState();
							}
						}

						if (state == DONE) {
							if (tempY - startY > 0) {
								state = PULL_To_REFRESH;
								changeHeaderViewByState();
							}
						}

						if (state == PULL_To_REFRESH) {
							headView.setPadding(0, -1 * headContentHeight + (tempY - startY) / RATIO, 0, 0);

						}

						if (state == RELEASE_To_REFRESH) {
							headView.setPadding(0, (tempY - startY) / RATIO - headContentHeight, 0, 0);
						}

					}

					break;
			}
		}

		return super.onTouchEvent(event);
	}

	// 当状态改变时候，调用该方法，以更新界?
	private void changeHeaderViewByState() {
		switch (state) {
			case RELEASE_To_REFRESH:
				arrowImageView.setVisibility(View.VISIBLE);
				progressBar.setVisibility(View.GONE);
				tipsTextview.setVisibility(View.VISIBLE);
				lastUpdatedTextView.setVisibility(View.VISIBLE);

				arrowImageView.clearAnimation();
				arrowImageView.startAnimation(animation);
				tipsTextview.setText(getResources().getString(R.string.pull_to_refresh_pull_label));

				break;
			case PULL_To_REFRESH:
				progressBar.setVisibility(View.GONE);
				tipsTextview.setVisibility(View.VISIBLE);
				lastUpdatedTextView.setVisibility(View.VISIBLE);
				arrowImageView.clearAnimation();
				arrowImageView.setVisibility(View.VISIBLE);
				// 是由RELEASE_To_REFRESH状?转变来的
				if (isBack) {
					isBack = false;
					arrowImageView.clearAnimation();
					arrowImageView.startAnimation(reverseAnimation);

					tipsTextview.setText(getResources().getString(R.string.pull_to_refresh));
				} else {
					tipsTextview.setText(getResources().getString(R.string.pull_to_refresh));
				}
				break;

			case REFRESHING:
				headView.setPadding(0, 0, 0, 0);
				progressBar.setVisibility(View.VISIBLE);
				arrowImageView.clearAnimation();
				arrowImageView.setVisibility(View.GONE);
				tipsTextview.setText(getResources().getString(R.string.pull_to_refreshing));
				lastUpdatedTextView.setVisibility(View.VISIBLE);

				break;
			case DONE:
				headView.setPadding(0, -1 * headContentHeight, 0, 0);

				progressBar.setVisibility(View.GONE);
				arrowImageView.clearAnimation();
				arrowImageView.setImageResource(R.drawable.arrow);
				tipsTextview.setText(getResources().getString(R.string.pull_to_refresh));
				lastUpdatedTextView.setVisibility(View.VISIBLE);

				break;
		}
	}

	public void setonRefreshListener(OnRefreshListener refreshListener) {
		this.refreshListener = refreshListener;
		isRefreshable = true;
	}

	public void setonLoadListener(OnLoadListener loadListener) {
		this.loadListener = loadListener;
	}

	public interface OnRefreshListener {
		public void onRefresh();
	}

	public interface OnLoadListener {
		public void onLoad();
	}

	@SuppressWarnings("deprecation")
	public void onRefreshComplete() {
		state = DONE;
		lastUpdatedTextView.setText("最后更新:" + new SimpleDateFormat("MM-dd HH:mm ").format(new Date()));
		changeHeaderViewByState();
	}

	private void onLoad() {
		if (loadListener != null) {
			moreProgressBar.setVisibility(View.VISIBLE);
			loadMoreView.setText(getContext().getString(R.string.more_data));
			loadListener.onLoad();
		}
	}

	public void onLoadComplete() {
		//		moreView.setVisibility(View.GONE);
		moreProgressBar.setVisibility(View.GONE);
		loadMoreView.setText(getContext().getString(R.string.more_data));
	}

	private void onRefresh() {
		if (refreshListener != null) {
			refreshListener.onRefresh();
		}
	}

	private void measureView(View child) {
		ViewGroup.LayoutParams p = child.getLayoutParams();
		if (p == null) {
			p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		}
		int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
		int lpHeight = p.height;
		int childHeightSpec;
		if (lpHeight > 0) {
			childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
		} else {
			childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
		}
		child.measure(childWidthSpec, childHeightSpec);
	}

	@SuppressWarnings("deprecation")
	public void setAdapter(BaseAdapter adapter) {
		lastUpdatedTextView.setText("最后更新:" + new SimpleDateFormat("MM-dd HH:mm ").format(new Date()));
		super.setAdapter(adapter);
	}


}
